I have a total of 7years of experience in eBusiness Operations, eBusiness global application senior analyst and Sales Manager.
How appropriate would it be for me to pursue a certification of PMP?
And how difficult is this exam?
How much does it cost in Indian Rupees?
What are the best institutes for training?

I think this link may help you
http://www.pmi.org/CareerDevelopment/Pages/AboutCredentialsPMP.aspx